When rashes, skin itching, persistent runny nose, shortness of breath, or wheezing appear, many people look for the cause not in an allergist's office, but in the concept of a "toxin-laden body." The internet is full of advice: cleanse the liver, do a detox, flush out toxins, check for parasites, or "restore gut health."

Heartburn after eating, stomach heaviness, nausea, belching, acid taste in the mouth, or pain in the upper abdomen — symptoms that many people try to ignore for months. Some attribute them to stress, poor diet, or "just gastritis," while others keep taking medications that only temporarily relieve the discomfort.